m = 10
n = 97
sum1 = m + n
x = 7.2
y = 15.3
sum2 = x + y
print("sum1=%d, sum2=%.2f" % (sum1, sum2))

n = 45
m = -n
x = -83.5
y = -x
print(m, ",", y)

print('----次方运算----')
print('3**4 =', 3 ** 4)
print('2**5 =', 2 ** 5)
print('----开方运算----')
print('81**(1/4) =', 81 ** (1 / 4))
print('32**(1/5) =', 32 ** (1 / 5))